My 07 impala 3.5 flex is making valve train noise after replacing intake manifold gasket, and replacing plugs and wires I've been told it may have something to do with pushrods and or hydraulic lifters here's my testing so far
steady 58 psi running holds 50psi after key off
Fpr- operates fine
Idle- 19 average but constantly fluctuates/flutter 3-4"hg
Snap throttle-0 and 25"hg high back to 19"hg slowly with a erratic fluctuation
1000rpm-20"hg pretty steady
Ac delco iridiums
Plugs gapped at 0.040"
Car has a weird loping feel at idle (very slight)
Can here constant ticking in car at idle
Idle is normally at 750-800rpm but intermittently it will drop about 100rpm or so when brakes are applied, and the engine begins to lope
I experience very inconsistent acceleration, loosing speed up hills
Doesn't want to hold rpms cruising in 2 or 3
The tranny isn't in the greatest condition but it has driven pretty much since the day I got it, and my problems got way worse after the manifold gasket replacement which is why I'm thinking valve train issues
have the same problem?
Thursday, March 1st, 2012 AT 4:22 AM